Fan type heater



May 3 1949. c. A. LINDBERG ETAL 2,469,234

FAN TYPE HEATER Filed OGC. 13, 1945 5 Sheets-Sheet 1 @if 4 50 f6'I /20 /g 5@ ,5,

May 3, 1949. c. A. LlNDBERG p -rAL 2,469,234

FAN TYPE HEATER v Filed oct. 13, 1945 s sheets-sheet 2 54 mi I /30 50 W40 J 35 Lil@ i 'l MMA/Top5:

HrraR/VEHS.

May 3, 1949.l c. A. LINDBERG E-rAL 2,469,234

FAN TYPE HEATER Filed oct. 15, 1945, 3 sheets-sheet s HOWARD IM ECKLES,

,chrom/5K5.

cam/L n. Lumens,

Patented May 3, 1949 UNITED STATES PATENT GFFICE FAN TYPE HEATER Application October 13, 1945, Serial No. 622,218

2.6 Claims.

The present invention relates to a fan type heater, and particularly to a fan type heater having electric heating units in combination with a fan for blowing air thereover, especially where the heating units are of the radiant type.

It is an object of the invention to provide Such a heater having a plurality of heating units separated by air ilow passages through which air may be discharged by means of a fan and, at the same time, heated.

A further object is to provide individual radiant heating units having characteristics providing for good radiation of heat and good conduction of heat into the air directed thereover.

A further object is to provide a heater of this kind in which the heat not discharged outwardly from the heater is restricted in its flow toward the top of the casing, whereby the casing is prevented from over-heating.

A further object is to provide a casing for such a heater, and especially one into which the Vari-- ous elements may be quickly and easily assembled or replaced.

More particularly, it is an object of the invention to provide a heater having a base and a casing rockable thereon, the casing being formed of two hollow sections joined together about substantially a medial plane, with a duct formed in the front casing section and removably supporting the heating elements, reiiectors therefor, and a blower or fan, whereby, when the sections are separated, the operating parts will be conveniently accessible for assembly and disassembly.

A further object is to provide a heater having a casing angularly adjustable on a base member with a particularly easily constructed and operated attachment between the two.

A further object is to provide a handle means having a particular location for most convenient carrying of the heater, and to prevent the heater being placed against a vertical surface in such a manner as to restrict flow of ir into fan or blower.

Other objects will appear from the accompanying drawings and ensuing description wherein:

Fig. 1 is a front elevation of the heater;

Fig. 2 is a side elevation of the heater, taken on the left of Fig. 1;

Fig. 3 is a rear elevation of the heater, partly broken away;

Fig. 4 is a medial front-to-rear vertical section through the heater, taken on the line 4--4 of Fig. 1;

Fig. 5 is a medial horizontal section, taken substantially on the line 5-5 of Fig. 1 and the line 5--5 of Fig. 4;

Fig. 6 is a partial vertical section of the lower part of the heater casing, looking from rear to front, taken on the line B6 of Fig. 4;

Fig. 7 is a horizontal section showing a fragment of the upper concave surface of the base, taken on the curved line 1--1 near the bottom of Fig. 4;

Fig. 8 is a plan view of the base section alone;

Fig. 9 is a plan View of one end of one of the reflectors;

Fig. 10 is a front elevation of one end of one of the reeotors;

Fig. 11 is an elevation of one of the casing supporting trunnions;

Fig. 12 is an elevation of one of the outer asbestos side insulators;

Fig. 13 is an inside elevation of one of the inner asbestos side insulators;

Fig. 14 is a view from the opposite side of Fig. 13 of an inner asbestos insulator;

Fig. 15 is a fragmentary section of the attaching strip between the casing sections, taken on the line I5-I 5 at the left edge of Fig. 6; and

Fig. 16 is a separated view of the center of the upper part of the casing sections, looking down at the top center of Fig. 4.

The heater, generally indicated at 20, includes a hollow base 2| and a hollow, two-section casing 22 mounted on the base for a certain rocking movement, as will appear.

The base 2| has a concave upper surface 23. This surface 23 has two symmetrical openings 24 and 25 therein (Fig. 8). The outer ends of the openings 24 and 25 have upstruck flanges 26 and 2l, respectively. Also, the openings 24 and 25, at their inner edges, have downturned flanges 28 and 29. (An opening in the bottom wall of the base is not to be confused in Fig. 8 with these downturned flanges 28 and 29).

The two openings in the upper concave surface 23 of the base provide between them a bridge wall 30 which has a transverse slot 3l therein.

The base is hollow, being preferably made from sheet metal. It has a bottom wall 34 with an lopening 35, already parenthetically mentioned,

two unions between each trunnion and the base may be made by welding. The trunnion 38 is provided with a substantially semi-circular socket 42 at its upper end, and the trunnion 39 is provided with a similar socket 43, these sockets 42 and 43 being formed by flanges turned out to provide bearing surfaces, as appear in Figs. 5 and 11.

The casing 22 consists primarily of a front section 50 and a rear section 5|, preferably substantially symmetrical, joined substantially along a medial, vertical, side to side plane. Each of the front and rear sections has an outturned abutment iiange. The section 50 has the abutmentJ flange 52, and the section 5| has the abutment flange 53. At spaced intervals along the sides, the abutment anges have ared projections and 55, respectively, to receive a channel-shaped` attachment strip 5S, which thereby is held in place and cooperates to secure the two sections 50 and 5| together. At the top of the two casing elements, the abutment flanges 52 and 53 have no flared portions, and consequently the strip` may be inserted by moving its ends downwardly from the top over the spaced outturned flanges 55. However, at the center of the top, there lapping tongues 58 and 59, shown separated The tongue Fig. 16 and together in Fig. 4. on the section 5| is offset to provide smooth outer contour to the overall casing. It is also threaded to receive a screw 60 which passes through a hole in the tongue 58.

The bottom of the casing sections are convex concentrically with the concave surface 23 of the base, both arcs being struck about the center of the trunnion openings 42 and 43. The 'adjacent edges of the bottoms of the two casing sections 5e and 5| are provided with a series of flanges. The casing section 50 has outer downturned flanges 62'and 63 abutting corresponding flanges on the back section 5|, the flanges being joined by ins or screws 64 and 65, respectively. These flanges extend into the openings 24 and 25 of the base. The lower edges of the casing section 55 are also provided with inner abutment flanges 55 and 3l adapted to abut corresponding flanges on the rear section 5|, these flanges likewise being disposed in the base openings 24 and 25.

Centrally, the casing section 50 is provided with a depending flange 10, and the rear casing section 5| with a corresponding flange 2|.' These flanges extend into the slot 3| of the base, and receive a friction leaf spring 72, the limits of which extend beyond the slot 3| and are conned between the two flanges 28 and 29 on the portion 30 of the base (Figs. 4, 6, '7). The spring 12 is conned by a cotter pin 'i3 beneath it and passing through the flanges 'i3 and 7l.

As will later appear, the upper casing 22 pivot about the centers of the trunnions and 43 with the convex bottom of the casing 22 moving within the concave upper surface 23'of the base. To permit this, the slot 3|, centrally of the base, accommodates the two flanges 'J0 and ll, and the openings 24 and 25 accommodate the other depending flanges. The two casing sections 50 and 5| have in their bottom convex walls corresponding notches providing slots 'i5 and 25 to accommodate the trunnions 33 and respectively, which are attached and project rigidly upward from the base.

The front casing section 50 has spot-welded thereto trunnion hubs or bearings 80 and 8i. These trunnion hubs are generally cup-shaped, as appjear in Fig. 5, and have bearing surfaces that are cradled within the semi-circular bearings 42 and 43 of the trunnions 38 and 33. By this means, the front casing section 50 and all of the associated parts, including the back section 5 I, are supported on the base. They may be lifted from the base only by removal of the cotter pin i3 and the spring 12. With these parts removed, the Whole upper casing 22 may be'lifted out of the trunnions.

The front section 50 likewise supports the heating and fan elements. The front section has a large opening 83 in it. Part of the metal from this opening is bent backwardly horizontally at e4, then downwardly at 85, and backward-.ly at It will be seen, by reference to Fig. 5, that the section 85 tapers inwardly downwardly. The flange 86 is secured, as by spot welding, to the inner surface of the bottom if the front section 50 ofthe casing. This bent portion provides a support for the fan and heater elements.

Additionally, there is a generally U-shaped member projecting upwardly from the horizontal portion 84 to provide side walls and a top wall for the heater andv blower mechanisms. This member, which may be generally designated 88, has two side walls 89 and 30, which have inturned bottom flanges 9| and 92, respectively, welded to the bottom of the section 84er the member The side walls likewise have inturned flanges S4 and 95, respectively, secured to the walls of the front casing section 50 about the opening 03.

The top wall 91 of the U-shaped member has an upturned front flange 98`that is united with the edge forming the upper part of the front opening 83. It will beseen, therefore, that the horizontal portion 84, with the two side walls 83 and S0 of the U-shaped member and the top wall 91 thereof, form a duct, open at the front through the opening 88, and open at its back at approximately the back of the front section 50 of the casing 22.' The two side walls 09 and 90 are lined rst with heat and electric insulators in the form of asbestos liners |0| and |02, the shape of which is shown in Fig. 12. These liners extend from the back edge'of each of the walls 89 and 30 forwardly to adjacent the inturned flanges S4 and 95. Additionally, there are two inner asbestos insulators |03 and |04; Figs. 13 and lfishow the conguration of the liner |03, Fig. 13 being the inner surface thereof, and Fig. 14 being the outer surface. The two liners at each side wall are fastened to their` respective side walls by means'of screws |05 passing through openings in the asbestos members and the side walls.

Referring to Figs. 13 and 14 for the details of the inner asbestos liners, it may be seen'that there is a series of vertically spaced openings |06 that are formed as circular enlargements in slots cut in from the forward edge of the member. The front slot portions are indicated at |01. The upper opening |06 has a backwardly extending slot |08, as does the bottom one. Additionally, each of the slots |01 isflanked by an upper notch |09 and a lower notch Ill).v Each opening |06 has backwardly spaced'therefrom a small hole As will hereafter appear, these notches |03 and |0, with the holes I support reflectorsfor radiant heater supports mounted within the holes |05.

Two arcuate notches I 2 and |'3 intersect each other at the bottom of the back edge of the mem-` ber |83, and have notches |l4'and ||4 extending forwardly therefrom.

Into the outer surface of the member |03 are cut two vertical grooves ||5 and |'|5 to receive and to insulate leads for the several coils. These two grooves are closed by the abutting surfaces of the asbestos liners.

The views show the asbestos liners in position and secured to the side walls 89 and 90. Heating coil supports H6, H1, H8, and H9 are supported at their ends in the openings |06, and they receive heating coils |20, |2|, |22 and |23, respectively. These coils are wired from terminals |26 and |21 secured in openings within the two outer liners |6I and |02, the same being thereby insulated from each other. A wire |28 extends from the terminal |26 in the slot H4 to the groove H5, thence upwardly to the back notch i'03 of the support H6. It passes through this notch and is wound about the support |6 to form the heating coll |20. At the other end of the support H6 it passes through .the notch |01 into the other groove H5' and upwardly to connect with the coil |2| in similar fashion. The open end of the top coil |23 passes through the top notch |08 to the groove H5', and thence back to the upper slot H4 and to the other terminal |21.

Each heating coil is disposed within a reflector E30. All of these reflectors are identical. They are generally U-shaped in cross section with relatively horizontal outer edges |3| and |32 top and bottom, merging by smooth curves into sloping upper and lower inner surfaces |33 and |34, these two surfaces being joined by an arcuate back wall |35, the back wall being concentric with the centers of the heater supports H6, etc.

The inner surfaces of these reflectors are preferably highly polished and plated.

At their ends, the reflectors are provided with upper and lower projections |38 and |39. Their back surfaces likewise have projections |40. The reflectors are supported in the inner asbestos liners by having their upper and lower projections |38 disposed within the upper and lower flanking notches |09 and H0, respectively, and with their center projections |40 disposed within the holes It will be seen that the several reiiectors are separated to provide air flow pas-A sages between them and above the topmost one and the top surface 91 of the U-shaped supporting member.

A fan and motor are mounted back of the reflectors. To this end, a fan supporting beam |44, of the longitudinal shape shown in Fig. 4, is provided. It is of channel-shaped cross section. Its lower end is attached by a screw |45 with the vertical portion 85 duct support. Its upper end overlies the top part 91 of the U-shaped support and is bolted thereto at |46. A fan motor |41 is secured to the frame |44 and supports the fan blade assembly |48 which fits adjacent the duct aforementioned and also close behind the reflectors. The back wall of the back casing member 5| is provided with a plurality of openings |50 to supply air to the fan. The back casing member likewise has a handle |5| disposed at the upper corner thereof. It provides a means for lifting the heater, which is out of sight from the front, and which is away from the hotter parts of the casing, and which gives a good balance point for carrying the heater.

The wiring of the heater includes a cable |55 brought into the hollow base through the back thereof to a switch |56 mounted at the front and providing an accessible switch button |51. From this switch, two cables extend upward through the opening 25 of the base. The first such cable |56 passes through a hole in the flange 86, and is supported in the channel-shaped motor supporting bracket |44 to provide leads-to the motor.

The other cable |60 carries two wires leading to the two terminals |26 and |21. The switch preferably turns on both the fan and the heaters at once.

A guard grill |65 is disposed over the front opening in the heater. It is here shown as consisting of a plurality of rods |65 welded together with a lower transverse rod |66 forming a stop means with the bottom ends |61 of the vertical rods. These ends |61 areslipped down through openings |68 in a horizontal member 8d with the bottom horizontal rod |36 acting as a ledge. The upper ends of the vertical rods are threaded at |69 and extend through the upper part of the casing member 50 until the top transverse rod |16. strikes the latter. Nuts |1| clamp a bracket i12 against the front of the casing and the flange` 08 to hold the grill removably in place.

Assembly and operation The construction of this heater is such that it can be readily assembled by line production methods which are relatively inexpensive. It also can be disassembled for repair purposes.

In any assembly operation, the base 2| will have the switch |56 attached thereto, and the electrical leads disposed therein. The front casing element 50 will have all of the mechanism ultimately secured to it.

The assembly of the mechanism on the front casing section is accomplished by first installing the two outer asbestos liners Isl and |02. The two opposite inner liners, with the heater supports, heaters, wires and reflectors, in proper positions, are then inserted. The screws |65 are fastened to secure these various elements together and to the supporting framework. The leads |25 and |20, as well as the lines from the switch in the base, are connected to the terminals |26 and |21. Thereafter, the motor may be installed, it having previously been mounted on the bracket |44, by fastening the screws |45 and |46 to hold the bracket |44 to the frame.

Thereafter, the two casing members 50 and 5| are brought together to have their abutment flanges against each other.

Screws 64 and 65 are passed through the flanges 62 and 63, respectively, of the two front and rear lcasing members. stalled at the top through the elements 58 and 59. The two flanges 10 and 1| are disposed through the metal slot 3| of the base where they are accessible through the opening 35 in the bottom of the base. The spring 12 is disposed over the flanges 10 and 1| and held in place by the pin 13. Then the trim strip 55 is slipped down from the top over the flaring flanges 54 and 55 disposed at intervals along both side edges, this completing the assembly.

It is clear thatthe angular position of the casing 22 may be varied by simply rocking the casing about the trunnions 38 and 39. The spring 12 permits this rocking to take place against friction, which will hold it in adjusted position.

What is claimed is:

1. In a heater, a framework, opposite insulating means removably secured at the sides of the framework, and having cutout portions therein, a heater support extending between the two insulating m'eans and secured by disposition in cutouts therein, a reflector open at the front and extending around the heater support, said reflector extending between the two insulating means and secured by disposition in cut-outs therein, a blowerv removably attached to said? The screw 63 is in-- framework, .andy a hollow casing to v,enclosei the framework', having a first section supporting the framework and a-'closuresection removably attached to the rst section.

. 2.1;In a heateiya, base, a two sectioncasing rockably mountedv on the. base, said sections ,comprising a front section. and .a rear =sectionboth hollowr substantially symmetrical, and.. -joinable about-almiddle line ofthe heater,A said two sec tions ,being :removably attached together, a;

framework in; the; first section, heating; means removablyl secured'vto; vthe framework, a -blower removably secured to the framework, whereby, whenlthe second section is removed; the mechanism will .be contained intherSt section, anda handledisposed at the upper rear corner. of the rear section.

3. In a heater, abase having a concave, arcuate, surface thereon, a vcasing supported on the base for rocking about the center of said arcuate surface,` said casingbeing in two sections, said sections. havingcooperating ilanges adapted to abut eachother to form ears that project through the arcuate surface-of thefbase; a slot inthe arcuate surface to receive -said ears and permit :limited rocking movement thereof, and of thecasing, and frictional means interengaging between the ears andthe base adjacent thereto, to restrict said rocking movement.

4. .In a heater, a basehaving a concave, arcuate surface thereon,a casing Supported on the base for rocking about the center of said arcuate surface, said casing being-in two sections, said sections having cooperating 4flanges adapted to abut eachother to form ears that project through the arcuate surface of thebase, a slot the arcuate surfaceto receive said ears and permit limited rocking movement thereof, and of Athe casing, upwardly open trunnions extending upwardly from' the base and into the casingandV bearings in the casing and rockable'in'the trunnions aboutfthe center-of'said arcuate surface of the base, and meansto hold the bearings'inthe trunnions.

5. In aheater, a basehaving a concave, *arcuof thecasing upwardlyopen trunnions extending.

upwardly fromthe-base and into the casing'and bearings-in the casing and rockable in the trunnions about the center of said arcuate surface of thev base, said bearings being whoollymounted on one section of the casing.

6. In a heaterjabase having an arcuate upper surface thereon, a pair` of vupwardly open trunnions extendingl upwardly from Vopposite/sides of the base, and-having bearing cradles concentric with the arcuate-surface, acasing having a front hollow section and a rear hollow section joined together substantially -along a medial line, bearings secured to the inside of the front section and rockable in the trunnions, said casing sections having openings to receive the trunnions and permit the rocking, heating means` removably supported-on the front section, and accessible, by removal ofthe rear section, and a blower removably supported on the Afront-section and accessible by removal of therearsection.

v1.In a heater, a base' having a pair of upwardly open trunnions upstanding therefrom. a casingiormed of twohollow sections, one a front and the-other a rearv section, means removably holdingthetwo sections together, a pair of bearings on the innersurface ofthe casing ttable downwardly into ,the trunnions,. a projection and slot,y arrangement-between the base and the casing, and .removable vfriction means lattached with said arrangementA to maintain the bearings in i.: projection andl slot arrangement comprising a flange `onthe casing projecting through a slot in the upper base wall, a spring friction device connected with the flange and engaging the base wall adjacent the slot, the said vbase wall being arcuate.

9.1' In a heater, a base having a pair of upwardly open trunnons'upstanding therefrom, a casing formed of two-hollow sections, one a front and the-other a-rear section, means removably holding Athe two sections together, apair of bearings on vthe inner surface of the casing iittable downwardly'into the trunnions, a projection and slot arrangement between the base and the casing, and removablefriction means attached with said arrangement to maintain the bearings in the trunnions and frictionally kresistrocking movement of the easing relatively to the base, the projection and slot arrangement comprising a flange ronthe casing projectingthrough a slotr in the upper base wall, a spring friction device connected with the flange and engaging the base wall adjacent the slot, the said base wall being arcuate, the casing having an. arcuate bottom withslotstheren to accommodate the trunnions.

110. In a heater, a base, a casing comprising a pair of hollow sheet-like v`casing sections having abuttingedges at thetopand Sidesinterengagingattachrnent means at thetop of the casing to hold thel sections together, lthe abutting edges ofthe` casing sectionsI at the. sides having outturned flanges, and a connecting strip having inturned flanges engageable overthe outturned flangesfor attachingthe casing sectionstogether fonready separation, means pivotally supporting the; casing on .the base, and heating means mounted in the-casing.

ll. In a heater, a sheet material -casingsectionfhaving .an air opening therethrough, material .from theopening being-bent backwardly therefrom atthebottom edge thereof, and vdownturnedfat its. back and ,attached to the inside of the bottom-surface .of the casing, sheet `material side and top walls connected with the backwardly-,bent materialfand-.forming.therewith a duct, heatingmeansmounted within the duct, .and a blower-attached tothe duct.

.-12. In a heater, a sheet materialcasingsection having an air openingv therethrough, .material from'the'openingtbeingi bent .,backwardly therefrom at the bottom edge thereof, and downturned at its back and attached to the inside of the bottorn surface of the casing, sheet material side and top walls connected with the backwardly bent material and forming therewith a duct, heating means mounted within the duct, and a blower attached to the duct, there being heat and electrically insulating liners for the side walls of the duct, a plurality of heating elements extending across from one liner to the other, a reflector device for each heating element, the reflector devices being spaced apart to provide air flow therebetween.

13. In an electric heater, a casing, an air flow duct in the casing having inlet means, an air outlet for discharge of heated air, and a blower` to cause air to flow through the duct and out the outlet, an elongated heating element supported on the casing within the duct, and having radiant heating coil means with a front part disposed opposite the outlet to deliver heat radiantly directly outward therethrough, and having other parts disposed to discharge radiant heat within the casing, an elongated reflector substantially coextensive with the elongated heating element, the reflector having an inner reflecting surface that extends in a curve around the back part of the heating element opposite the outlet, and in spaced relation thereto, and the reflector having inner side surfaces that extend toward the outlet from the back surface, in spaced relation to the side parts of the heating element, and terminating in forward edges spaced from the heating element and extending forwardly to permit free passage of radiant heat out the outlet from the front part of the heating element, and by reflection from the other parts of the heating element, the outer surface of the reflector being curved on its back side, and extending forward at its sides toward the outlet, and terminating in forwardly extending edges joined with the forward edges of the inner surfaces, and the reflector having its outer surface shaped, as aforesaid, to permit flow of the air against the back of the reflector, and around its sides, the forward edges of the reflector extending substantially in the direction of flow of said air moved through the duct by the blower, and means in the air flow duct adjacent to but spaced from the reflector, said means also having forwardly extending edges spaced a substantial distance from the forward edges of the reflector, the adjacent means and the reflector thus providing air flow passage means with its forward surfaces extending forwardly to cause air to discharge from the outlet directly forwardly in substantially the same direction as radiant heat from the front part of the heating element.

le. In an electric heater, a casing, an air flow duct in the casing having an inlet, a forward outlet for discharge of heated air, and a blower to cause air Ato flow through the duct and out the outlet, a plurality of elongated heating elements each extending across the duct and supported at its ends, the elements being between the inlet and the outlet, each heating element comprising coil means with forward parts disposed to discharge radiant heat out the outlet, and other parts radiating heat toward the inside of the casing, a plurality of elongated, heat conducting reflectors, one for each heating element, all being disposed across the air duct between the heating elements and the inlet, each having an inn-er curved surface back of its heating element to vreflectheat from the coil forwardly, and to be heated by the coil, and having forwardly extending inner side surfaces that are spaced from the coil and project forwardly toward the opening therefrom, and terminate in edges spaced from the coil on opposite sides thereof, whereby direct and reflected radiant heat from the coils may emit from the outlet, each reflector having an outer surface that is curved on its back toward the inlet, and extends around the sides and forwardly to join the forward edges of the inner surfaces, the forward parts of the outer surfaces extending to said edges substantially forwardly, and forward edges of adjacent reflectors being spaced and shaped to provide air flow channels that extend through from behind to forwardly of the heating elements to direct air forwardly out the outlet of the casing substantially in the direction of radiant heat emitted from the outlet.

15. In a heater, a casing, a pair of opposite walls therein formed of insulating material, an elongated heating element extending across between said walls, said walls having recesses to receive the ends of the heating element and support the same, a reflector for disposition around the heating element, the reflector comprising a channel-shaped member with its open side' provided for delivery of radiant heat from the element, the two walls having recesses spaced from the recesses for the heating element, and the reflector having extensions interfltted into said spaced recesses for supporting the ends of the reflector in said walls.

16. In a heater, a casing, a pair of opposite walls therein formed of insulating material, an elongated heating element extending across between said walls, said walls having recesses to receive the ends of the heating element and support the same, a reflector for disposition around the heating element, the reflector comprising a channel-shaped member with its open side provided for delivery of radiant heat from the element, the two walls having recesses spaced from the recesses for the heating element, and the reflector having extensions interiltted into said spaced recesses for supporting the ends of the reflector in said walls, said heating element recesses and the reflector recesses extending through said walls, and additional panels of insulating material outside said walls and contiguous thereto to close said recesses.

17. In a heater, a casing, a pair of opposite walls therein formed of insulating material, an elongated heating element` extending across between said walls, said walls having recesses to receive the ends of the heating element and support the same, a, reflector for disposition around the heating element, the reflector comprising a channel-shaped member with its open side provided for delivery of radiant heat from the element, the two walls having recesses spaced from the recesses for the heating element, and the reflector having extensions interfitted into said spaced recesses for supporting the ends of the reflector in said walls, said heating element recesses and the reflector recesses extending through said walls,y andadditional panels of insulating material outside said walls and contiguous thereto to close said recesses, and wiring grooves in an interface of one of said contiguous insulating elements, to receive wiring for the heating element. v

18. In a heater, a casing through which air may be drawn, opposite insulative side panels, support means in the ca singto hold the walls,

including -lateral supports 'againstl which the insulative sidewalls may be'remova'bly engaged and held, fheatin'g r`m`ear'is`-s1ipported between the in sulative panels, and re'ctor means adjacent the heating means andremovably supported between the panels, one of saidlast named two means having abutment means at itsfends, engageable with the panels, to holdy the 'panels separated against the lateral-supports, the panels, heating means, and reflector means being vslidable from the support means'.

19. In a-lheaten` a Leasing-through which air may be drawn, oppositeA linsula'tive side panels, support means in `tl'lecasingtohold the walls, including lateral supports against whichthe insulative side walls may be' removably engaged and'held, heatingmean's-supported between the insulative `panels, and reflector means adjacent the heating meansand removably supported between the panels, the reflector 'means having a length to fitbetween-the insulative panels when both 'are against their lateral supports, and having lugtype interengagingmeans with the panels and end parts -engageable with'lthe panelsv to hold the panels in spacedf'relationshlp yand against the lateral supports.

20. In' a heater,A a casing through whichair may be drawn, opposite -insulative side panels, supportmeans in the casing-to -hold the walls, includinglateralf supports 4'against which` the insulative "side 'walls may `1 bev removably engaged and held, heating'meanssupported between the insulative panels, and'frefiector means adjacent the heating means and 'removably supported between the panelsthe reflectorv means havinga length-'to fit -b et'weeny thefinsulative panels when both are against their lateral supports and having lug-type interengaging means with thepanels and end partsengageablewlth thepanels to hold the panels in spaced 'relationship and against the lateral supports Athe'support 'means fin' the casing comprising walls formingalduct having anv outlet, the panels'heatingmeans and reflectors being slidable vinto the ducttowardthe outlet, and stop means adjacent thel outlet against which the panels maybe positioned:

21..- In a heater, acas-lng'through which air may 'be drawn, oppositev insulat-ive side panels, support means inthe casing to hold the walls, including lateral" supports' against which the insulative side walls mayberemovably engaged and held, heating means supported between the insulative panels, and reect'or means adjacent the `heating' means 'and'removably supported between the panels, the reflectormeans having a' length tofltfbetweenthefin'sulative panels when both are" against their lateral supports, and having lug-type interengaging means with the panels and end parts engageable with the panels to-'hold thepanelsin spaced relationship and against the lateralsupports,4 the'support means in the casing comprl'slngwalls forming a duct having anV outlet, the panels,C heating' means and reflectors beingv slidable'y into: the duct toward theoutlet, and'stop'means 'adjacent the outlet against which vthe panels maybe positioned, the casinghaving aforward sectionvand a rearward section, the support means and parts thereon supported being 'in fthe -forward section, anda blower attached *to lthe forward section, removably, behind-the reilector'm'eans.

22. In a device of the kind described, a hollow casing, a base therefor, upwardly open trunnions upstanding from the base, the casing having 'bottom openlng'means to receive the trunnions within they hollow casing, bearing means in the CaSngengageabIe Iwith the trunnions when the casing is lowered onto the trunnions for rocking of the casing on the base, and means to hold the casing against removal from the base, outlet means 'in the casing, and heatermeans inthe casing for delivery of heat from the outlet.

23, In a device of the kind described, a hollow casing, a base therefor, upwardly open trunnions upstanding from the base, the casing having bottom opening means to receive the trunnions within the hollow casing, bearing means in the casing-engageable with the trunnions when the casing is lowered onto the trunnions for rocking-ofthe casing on the base, and means to hold the casing against removal from the base, outlet'means in the casing, air inlet means to the casing, andair blowing means mounted on the casing to draw air into the inlet means and out the outlet means.

24. In a device of the kind described, a hollow casing, a base therefor, upwardly open trunnions upstanding from the base, the casing having bottom opening means vto receive the trunnions within the hollow casing, bearing means in the casing engageable with the trunnions when the casing is lowered onto the trunnions for rocking of the 'casing on the base, and means to hold the casing against removal from the base, outlet means in the'casing, the means to hold the casing on the `base-including frictional interengaging means between the casing and the base to restrictrocking movement of the casing.

25. Ina device of thekind described, a base member, a hollow casing member, upwardly open trunnions on the base member upstanding into the casing member, bearing means on the casing member engageableY onto the trunnions when the casing member is lowered toward the base member, one of said two members having an arcuate surface adjacent the other member, with an opening through` said surface, the other member having a projection through said opening adjacent the arcuatev surface beside the opening, and frictional means on the projection overlying the arcuate surface tor engage the surface and restrict rocking of the casing on the base member.

26. In a device of the kind described, a base member, a hollow casing member, upwardly open trunnions on the base member upstanding into the casing member, bearing means on the casing member engageable onto the trunnions when the casing member is lowered toward the base member, one of said two members having an arcuate surface adjacent the other member, with an opening through said surface, the other member having a 'projection through said opening adjacent the arcuate surface beside the opening, and frictional means on the projece tion overlying the arcuate surface to engage the surface and restrict rocking of the casing on theV base member, the arcuate surface being on the base member and the projection being on the casing member, and means removably attaching the frictional means to the projection, whereby the casing may be lifted from the trunnions.

CARYL A. LINDBERG. HOWARD W. ECKLES.

(References on following page) REFERENCES CITED Number Name Date 1,942,758 Jessup Jan. 9, 1934 lThuf fowmtg xieferences are of record in the 2,119,161 Hay May 31 1938 e 0' 1S pa e 2,120,795 Boothby June 14, 1938 UNITED STATES PATENTS 5 2,171,662 Marchand Sept. 5, 1939 Number Name Date 2,257,342 Lmtern Sept. 30, 1941 1 429 130 Dutton Sept 12 1922 2,369,803 Safrdeson Feb- 20, 1945 2,372,832 Jepson Apr. 3, 1945 1,908,559 Roser May 9, 1933 

